Multiple-filament lamp



SeptnS, 1925.

F; P. FOULK MULTIPLE FILAMENT LAMP F11-doom 18. 1920 Patented Sept. 8,19,25..

UNITED STATES PATENT OFFICE.

MULTIPLE-FILAMENT LAMP.

application mea october 1a, 1920. serial No. 417,541.

To all whom t may concern:

Be it known that I, FRANCIS P. Bfo'omi, a citizen of the 'United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented new and useful Im rovements in Multiple-Filament Lamps, owhich the following is a specification.

This invention relates to a multlple filament lamp and has foritsprnnary ob]ect the novel mannerof arranging the filamentand passingcurrent therethrough so that should one or more filaments be destroyedthe remaining filaments will continue :to glow thereby preventing thelamps from be coming useless.

An object of the invention 1s the novel manner of arran ing the leads,supports, and filaments so t at a systematic arrangement can be given tothelaments and llght distributed properly thereby greatly 1ncreasing theusefulness of the lamp.

With these and other objects in view the invention will be betterunderstood from the following detailed description taken in connectionwith the accompanyingdrawing wherein:

. Fig. 1 is a diagrammatic view illustrating the relation of thefilaments.

Fig. 2 is a top plan view:

Fig. 3 is a diagrammatlc view, showing the method of wiring nitrogentype lamp.

Again referring to the drawingillustrating my invention the numeral 1designates the usual glass stem of an electric lamp. This stem haspassingtherethrough, at right angles, two leads 2 and 3, one posltiveand the other negative. An upper set of supports 4 is arrangeddirectly'below the leads and a lower set of supports 'is connected 40 tothe lower end of the stem. The filaments 6 are connected and supportedby the supports in a manner to have zigzag formation and areelectrically connected to the leads to provide sections 7, 8, 9, and 10,each re? ceiving current independent of the other section as `clearlyshown in Fig. 2 so that should one section burn out the remainingsections will continue to glow and this action w-ill continue until eachsection is burned out hereby materially prolonging the life of the am fIn `Figure y3, I have illustrated the usua vnegative current wire a andthe usual positive current wire b connected to the leads 2 and 3 so thatthey may be electrically connected to any source of supply.

It is, of course, yto be understood that any number of leads may be usedto provide any number of sections and the filaments may be supported bythe stem in other relations, therefore, I do not desire to be limited inany manner except as set forth in the claim hereunto a pended.

Having t ius described my invention what I claim 1s:

An incandescent lamp including a supporting stem, supports radiatingfrom the stem, a filament mounted upon the supports,

l and leads extending from the stem at an 7" angle to each other anddisposed alternately between certain of the supports to support andelectrically connect the filament in inde pendent groups.

In testimony whereof I affix m si FRANCIS P. IPO

nature. K.

